 Advantages of H-Beam rods over stock in a 2.0L |
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| Woody |
 Mar 1 2015, 08:19 PM
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#41
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Sandbox Rabblerouser and head toilet scrubber  Group: Members Posts: 3,858 Joined: 28-December 10 From: San Antonio Texas Member No.: 12,530 Region Association: Southwest Region  |
QUOTE(Jake Raby @ Mar 1 2015, 04:13 PM)  Woody, I love 5.325" rods with an 80 crank, it'll snatch your head off. I've been using them since around 1995 :-) Thanks Jake I appreciate the input. (IMG:style_emoticons/default/beerchug.gif) I sure had an adventure making the rods clear the cam. The cam is on a reduced base circle and the rods are 2" on the big end. I don't see how you could go much bigger on the stroke. Now to get the rods balanced again. The nice thing is the deck height is right at .005 without shims. I'm going to run it at .040. |
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| Jake Raby |
Mar 1 2015, 11:26 PM
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#42
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The magic number for a reduced BC on a T4 cam with up to .390" lobe lift is 1.045"
I can make the rods clear with 1 gram removed from each corner as long as they use 5/16" bolts instead of 3/8". This combo will drop in, generally. |
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| Woody |
Mar 2 2015, 07:11 AM
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#43
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Sandbox Rabblerouser and head toilet scrubber Group: Members Posts: 3,858 Joined: 28-December 10 From: San Antonio Texas Member No.: 12,530 Region Association: Southwest Region |
I went with the 3/8" rod bolts. Kicking myself now but I got them to fit. Just had to take off more than I wanted. I would like to be able to twist this thing to a safe 7,000 rpm and I was leery of using the smaller rod bolts with a 98mm piston. I'm sure they would have handled it in stride.
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| Jake Raby |
Mar 2 2015, 08:10 AM
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#44
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
The issue is all the material removal makes for a weaker rod than one that has a 5/16 bolt with less clearancing... Guess how I know.
The smaller bolt is no problem if you use an ARP 2000 custom aged bolt, or a SPS- CARR bolt. I have one engine with 5/16 bolts that puts down 595 RWHP at 35 PSI boost. The rod bolts are changed once per year. It's all in the combo! |
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| Woody |
Mar 2 2015, 08:29 AM
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#45
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Sandbox Rabblerouser and head toilet scrubber Group: Members Posts: 3,858 Joined: 28-December 10 From: San Antonio Texas Member No.: 12,530 Region Association: Southwest Region |
That's certainly what it's look like. I am using ARP 2000 bolts. 595 hp is very impressive. Yearly teardowns are part of the plan. It's not too late to go with 5/16" rods. Maybe I'll do that for more piece of mind.
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| Jake Raby |
Mar 2 2015, 09:45 AM
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#46
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
I think I would. I've ripped the threads out of a rod cap in the past when doing it the way you are now.
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| Woody |
Mar 2 2015, 10:29 AM
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#47
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Sandbox Rabblerouser and head toilet scrubber Group: Members Posts: 3,858 Joined: 28-December 10 From: San Antonio Texas Member No.: 12,530 Region Association: Southwest Region |
it looks like there's plenty of thread engagement but I had to take off more than I am comfortable with. I'll try the 5/16 rods and report back. I've got enough money in this one to not take any chances. Thanks Jake.
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